Thanks I'm open to use escrow.
That's the right attitude. Being open and willing to use escrow. Without escrow, this would have been a blatant and brazen scam.
But now that you offered to accept and use escrow, this is turning out to sound more like a legitimate and genuine offer.
The entire bitcoins should be escrowed. Even the amount for shipping. Nothing should be paid upfront without escrow because that is what most scammers usually do. They accept escrow but part of the amount must be paid upfront for shipping and taxes. The actual scam is centered on the amount paid upfront. They don't really care about the escrowed balance. To avoid this scam, buyer must have the entire payment escrowed.
Good luck with selling them. Now that you offer to use escrow I'm sure you will soon see posts here from interested buyers.